Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/1992
Título: Gold deposition from 1-butyl-1-methyl-pyrrolidinium dicyanamide ionic liquid at open-circuit and under potentiostatic control
Autor: Sá, A. I. Correia de
Eugénio, S.
Quaresma, S.
Rangel, C. M.
Vilar, R.
Palavras-chave: Gold
Electrodeposition
Ionic liquids
Open-circuit deposition
Data: 2013
Editora: Elsevier
Citação: Sá, A.I. Correia de; Eugénio, S.; Quaresma, S.; Rangel, C.M.; Vilar, R. Gold deposition from 1-butyl-1-methyl-pyrrolidinium dicyanamide ionic liquid at open-circuit and under potentiostatic control. In: Surface and Coatings Technology, 2013, Vol. 232, p. 645-651
Resumo: In this work, the deposition of gold on copper substrates from solutions of HAuCl4.3H2O in 1-butyl-1-methylpyrrolidinium dicyanamide was studied. Deposition was carried out in open-circuit and under potentiostatic control at temperatures from 293 to 353 K, in normal atmosphere, with deposition conditions allowing water from atmospheric absorption up to 0.8 wt.%. Films of gold were obtained by both methods. Deposition at open-circuit occurs by galvanic displacement mechanism. Involvement of Cu+ species in the electrodeposition process was suggested by cyclic voltammetry. Furthermore, copper incorporation in the gold films was confirmed by X-ray diffraction. SEM observation and XRD analysis show that films are nanocrystalline with a globular morphology except for the films formed under potentiostatic control at 353 K, which show a dendritic structure. The size of the crystallites determined by Scherrer's equation varies in the range from 6 to 25 nm.
URI: http://hdl.handle.net/10400.9/1992
ISSN: 0257-8972
Versão do Editor: http://dx.doi.org/10.1016/j.surfcoat.2013.06.061
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